rpcrt4: fix compiler warnings on non-i386

[Austin English]

Tested on PowerPC/x86/x86_64.

-- 
-Austin
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diff --git a/dlls/rpcrt4/cstub.c b/dlls/rpcrt4/cstub.c
index 95ac1d8..1a2ab5d 100644
--- a/dlls/rpcrt4/cstub.c
+++ b/dlls/rpcrt4/cstub.c
@@ -120,6 +120,7 @@ typedef struct
 
 static ref_counted_vtbl *current_vtbl;
 
+#if defined(__i386__)
 
 static HRESULT WINAPI delegating_QueryInterface(IUnknown *pUnk, REFIID iid, void **ppv)
 {
@@ -137,8 +138,6 @@ static ULONG WINAPI delegating_Release(IUnknown *pUnk)
     return 1;
 }
 
-#if defined(__i386__)
-
 /* The idea here is to replace the first param on the stack
    ie. This (which will point to cstdstubbuffer_delegating_t)
    with This->stub_buffer.pvServerObject and then jump to the